Penetrating Cloudflare’s Defenses: Finding the True Host IP

The author of the post works in the field of offensive security and is having difficulty bypassing Cloudflare's protection to find the real IP address of the server behind a website. They have tried several methods, including checking old DNS records and more advanced techniques, but without success. They are therefore asking what are the real and effective methods to bypass Cloudflare and obtain the original IP address of the server.